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using System;
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
using System.Buffers;
#endif
using System.IO;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Asn1
{
/**
* Der BMPString object.
*/
public class DerBmpString
: DerStringBase
{
internal class Meta : Asn1UniversalType
{
internal static readonly Asn1UniversalType Instance = new Meta();
private Meta() : base(typeof(DerBmpString), Asn1Tags.BmpString) {}
internal override Asn1Object FromImplicitPrimitive(DerOctetString octetString)
{
return CreatePrimitive(octetString.GetOctets());
}
}
/**
* return a BMP string from the given object.
*
* @param obj the object we want converted.
* @exception ArgumentException if the object cannot be converted.
*/
public static DerBmpString GetInstance(object obj)
{
if (obj == null)
return null;
if (obj is DerBmpString derBmpString)
return derBmpString;
if (obj is IAsn1Convertible asn1Convertible)
{
Asn1Object asn1Object = asn1Convertible.ToAsn1Object();
if (asn1Object is DerBmpString converted)
return converted;
}
else if (obj is byte[] bytes)
{
try
{
return (DerBmpString)Meta.Instance.FromByteArray(bytes);
}
catch (IOException e)
{
throw new ArgumentException("failed to construct BMP string from byte[]: " + e.Message);
}
}
throw new ArgumentException("illegal object in GetInstance: " + Platform.GetTypeName(obj));
}
/**
* return a BMP string from a tagged object.
*
* @param taggedObject the tagged object holding the object we want
* @param declaredExplicit true if the object is meant to be explicitly tagged false otherwise.
* @exception ArgumentException if the tagged object cannot be converted.
*/
public static DerBmpString GetInstance(Asn1TaggedObject taggedObject, bool declaredExplicit)
{
return (DerBmpString)Meta.Instance.GetContextInstance(taggedObject, declaredExplicit);
}
private readonly string m_str;
internal DerBmpString(byte[] contents)
{
if (null == contents)
throw new ArgumentNullException("contents");
int byteLen = contents.Length;
if (0 != (byteLen & 1))
throw new ArgumentException("malformed BMPString encoding encountered", "contents");
int charLen = byteLen / 2;
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
m_str = string.Create(charLen, contents, (chars, bytes) =>
{
for (int i = 0; i < chars.Length; ++i)
{
chars[i] = (char)((bytes[2 * i] << 8) | (bytes[2 * i + 1] & 0xff));
}
});
#else
char[] cs = new char[charLen];
for (int i = 0; i != charLen; i++)
{
cs[i] = (char)((contents[2 * i] << 8) | (contents[2 * i + 1] & 0xff));
}
m_str = new string(cs);
#endif
}
#if !(NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER)
internal DerBmpString(char[] str)
{
if (str == null)
throw new ArgumentNullException("str");
m_str = new string(str);
}
#endif
/**
* basic constructor
*/
public DerBmpString(string str)
{
if (str == null)
throw new ArgumentNullException("str");
m_str = str;
}
public override string GetString()
{
return m_str;
}
protected override bool Asn1Equals(Asn1Object asn1Object)
{
DerBmpString that = asn1Object as DerBmpString;
return null != that
&& this.m_str.Equals(that.m_str);
}
protected override int Asn1GetHashCode()
{
return m_str.GetHashCode();
}
internal override IAsn1Encoding GetEncoding(int encoding)
{
return new PrimitiveEncoding(Asn1Tags.Universal, Asn1Tags.BmpString, GetContents());
}
internal override IAsn1Encoding GetEncodingImplicit(int encoding, int tagClass, int tagNo)
{
return new PrimitiveEncoding(tagClass, tagNo, GetContents());
}
private byte[] GetContents()
{
char[] c = m_str.ToCharArray();
byte[] b = new byte[c.Length * 2];
for (int i = 0; i != c.Length; i++)
{
b[2 * i] = (byte)(c[i] >> 8);
b[2 * i + 1] = (byte)c[i];
}
return b;
}
internal static DerBmpString CreatePrimitive(byte[] contents)
{
return new DerBmpString(contents);
}
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
internal static DerBmpString CreatePrimitive<TState>(int length, TState state, SpanAction<char, TState> action)
{
return new DerBmpString(string.Create(length, state, action));
}
#else
internal static DerBmpString CreatePrimitive(char[] str)
{
// TODO[asn1] Asn1InputStream has a validator/converter that should be unified in this class somehow
return new DerBmpString(str);
}
#endif
}
}
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